*{margin:0px;padding:0px;}
.banner{width: 1180px;height:500px;margin:50px auto 0;/*上 左右（居中）下*/;overflow:hidden;}
.banner .left{width: 80px;height:500px;background:rgba(0,0,0,0.4);float: left;}
.banner .middle{width: 1020px;height:500px;float: left;position: relative;}
.banner .right{width: 80px;height:500px;background:rgba(0,0,0,0.4);float: left;}
.banner .left img{display: block;margin:219px auto 0;}
.banner .right img{display: block;margin:219px auto 0;}
.banner .middle ul{width: 1000%;height:500px;position:absolute;top:0px;left:-1020px;z-index:-1;}
.banner .middle ul li{width: 1020px;height:500px;list-style-type:none;float: left;}
.banner .middle ul li .l_con{float: left;border:5px solid #000;border-top:10px solid #000;border-bottom:10px solid #000;}
.banner .middle ul li .r_con{float: right;border:5px solid #000;border-top:10px solid #000;border-bottom:10px solid #000;}
